Soldering pot



W. L. MARTIN SOLDERING POT Ma rch 17, 1925.

Filed March so, 1925 3/ IIS U! 11 7700' a m m mm m ML; mw m d k m Patented Mar. 17, 1925. i h UNITED STATES PATENT OFFICE.

WENDELL L. MARTIN, OF CLEVELAND, OHIO, ASSIGNOR TO GENERAL ELECTRIC COM- PANY, A CORPOlBJATION OF NEW YORK.

SOLIDERIN G P O T.

Application filed March 30, 1923. Serial No. 828.893.

T (4H ur/wm it may concern: a suitable magnetic material, such as iron Be it known that I, WVENDELL L. MARTIN, or steel and forming a container for the a citizen of the United States, residing at soldering bath 11 This tubular member Cleveland, in the county of Cuyahoga, State is shown as comprising two parallel up- 6 of Ohio, have invented certain new and useright sections 12, only one of which is 60 ful Improvements in Soldering Pots, of shown, which have their lower ends connectwhich the following is a specification. ed by a U-shaped connection 13, having a My invention relates to solderng-pots, smaller diameter. Although only half of such for instance as electrically heated solthe soldering pot comprising one uprght dering pots, and has for its object the prosection 12 is shown in detail in the drawing, 65 vision of a simple, reliable and efiicient deit will be understood that the other half of vice of this character, in which provision is the pot is constructed in a similar manner. made whereby the solder may be applied Extending centrally of each section 12 is only to the desired parts of the article to be a smaller pipe 14 which is secured at its 1: ld d, lower end in the connecting member 18. In

In the soldering of various articles it, has the arrangement shown in the drawing been the practice to immerse the article to standard pipe fittings are used. A reduc the desired extent in a bath of molten soling coupling 15 is secured to the lower end der. With this method the solder is often of section 12 and the lower end of pipe 14 applied to various parts of the article where is threaded and screwed into coupling 15 75 it is unnecessary or undesirable. This is whereby pipe 14 is secured central of section particularly true in the soldering of com- 12. The lower end of pipe 14 also extends mutators for small electric motors. These downward through the coupl'ng 15 and commutators are usually soldered after beserves as a nipple connecting elbow 16,

1 ing mounted on the rotor shaft so that the forming a part of connecting member 13,

end of the shaft must be immersed in a solto coupling 15. Elbow 16 is in turn conderingbath in order to apply the solder to nected through a short horizontal pipe 17 the commutator. to a second elbow 16 forming a part of the In carrying out my invention in one form other half of the apparatus. The pipe lat.

as applied to the soldering of commutators extends upward somewhat over half the $3 for small motors, I provide a floating shield length of section 12 and is normally imin the soldering bath which closely fits .the mersed in the soldering bath 11, as shown end of the shaft and parts of the commutain the drawing. tor to which it is not desired to apply the Slidably mounted in the pipe 14 is a solder. By means of my invention the end plunger or float 18 bearing on its upper end an of the shaft may be inserted in the shield a suitable shield 19. The plunger 18 floats and the whole depressed in the soldering in the soldering bath and carries the shield bath until the solder comes in contact with 19 which, when not in use, projects above the parts of the commutator to be soldered. the soldering bath and, as is shown in the My invention also comprehends an imdrawing, above the section 12. In the form 95 proved form of electrically heated solderof my invention shown in the drawing ing pot in which the solder is heated by ourshield 19 is particularly adapted for solderrents induced in both the container and the ing commutators on small motors. It is solder. provided with a central bore or recess 20 For a more complete understanding of adapted to receive the rotor shaft on which we my invention reference should be had to the the commutator is mounted, and is enlarged accompanying drawing in which Fig. 1 is at the top to receive the end of the coman elevation view, partially in section, mutator.

showing a soldering pot embodying my in In using my invention, the end of the vention; Fig. 2 is a plan view of Fig. 1; shaft on which the commutator is mounted, in; while Fig. 3 is a diagrammatic view showas well as the adjacent end of the commutaing the connections for the energizing coils. tor, is inserted in the floating shield 19,

In accordance with one form of my inand then the commutator is depressed, carryvention the soldering pot 10 comprises a U- ing with it the shield, into the soldering shaped tubular member or pipe 11 made of bath. A suitable aperture 21 is provided in the lower end of pipe 1% through which the molten solder is free to flow as plunder 18 is forced downward. In this manner the parts or portions of the commutator and the lower end of the shaft to which it is eitherundesirable or unnecessary to apply the solder are protected by the shield 19, the solder being applied only to the desired parts. A- collar 22 is provided in the upper end of pipe 14: to prevent plunger 18 from being pulled" out. "It will be observed that pipe 14 serves as a guide for the plunger.

The U-shaped container 11 for the solder is preferably heated by inducing currents therein by means of energizing coils 23 mounted on the sections 12. As shown in the drawing each coil 23 is wound in layers separated by layers of heat insulation 24. By using the heat insulation between the pipe 12 and the winding, the pipe may be operated at a higher temperature than the winding, Upon energization of the coils 23,

a magnetic flux is set up in both the U- shaped container 11 and the solder whereby heating currents are induced therein.

As shown in Fig. 3, the energizing coils 23 may be provided with taps whereby different degrees of heat may be obtained. In Fig. 3 is shown an arrangement whereby two operating temperatures may be obtained by throwing a 3-pole, double-throw switch 25 in one position or the other. By throwing the switch in one position, as shown in Fig. 3, the two energizing coils 23 are connected in parallel across the supply source 26, while by throwing the switch 25 in its other position two of the three sections of each coil are connected in series across the supply source. The first connection obviously gives a greater degree of heat, since the entire number of turns of both coils are energized and this energization is greater than with the second connection. 7

As shown in the drawing, the U-shaped container 11 is mounted on a suitable base or support 27.which may be attached by suitable bolts 28 to the table 29 in a convenient posit1on.- The container is secured to the base by means of a clamping strap 30. The sections 12 and the coils 23 are heat insulating material.

preferably encased in a layer 31 of suitable The topof the pot is sealed flush with the ends of sections 12 by a layer 32 of suitable heat insulating material, such as plaster Paris. WVhile I have described my invention as embodied in concrete form and as operating in a specific manner in accordance with the provisions of the. patent statutes, it should be understood that I do not limit my invention thereto since various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

hat- I claim as new and desire to secure by Letters Patent of the United States, is,'-

1. A soldering pot comprisinga container, 'a soldering bath in said container, and a shield for a portion of the article to be soldered buoyantly supported by said bath,

" said shield being adapted to be depressed into said bath so as to effect the application of the solder to the desired parts of the article and protect the portion within the shield. I

2. A soldering pot comprising a container, a soldering bath in said container, a float supported in said bath, a guide for said float, and a shield carried by said float adapted to receive aportion of the article to be soldered.

3. A soldering pot comprising a container, a soldering bath in said container, an up right tubular guide member in said container, a plunger fitting in said guide float- 111g in said soldering bath, and a shield carrled by said plunger adapted to receive a portion of the article to be soldered.

4. A soldering pot comprising a U-shaped.

container, an energizing coil on said container for inducing heating current therein, a soldering bath in said container, and a shield for a portion of the article to be soldered in each arm of said container buoyantly supported by said bath.

In witness whereof, I have hereunto set my hand this twenty-fourth day of March, 1923.

WENDELL MARTIN. 

